Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
nam quoc » nam duoc, nam buoc, nam thuoc
thu hang » thi hang, thuc hanh, thu huong
ly hang » ly quang
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
va hoi » xa hoi, va hoc, va hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((thu hang) or (ly hang)) va hoi. hieu van nam quoc ban thanh van ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu hang) OR (ly hang)) va hoi. hieu van nam quoc ban thanh van ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((thu hang) or (ly hang)) va hoi. hieu van nam quoc ban thanh van ((cua tre) or (su triet))*.